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Do I need more RAM?
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Ah! So it doesn’t sound normal! Good – we finally have something to work with. We’ll start investigating the drive. Thanks!
Nick
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Hmmm. Took the AJA system test across the hall and tested the read/write speeds on a different system over there. Both the read and write speeds over there are over 200MB/s – quite a difference from my system, reading @ 175 and writing @ 46. We swapped out my ATTO SCSI card to see if it was that – but my read and writes are the same…
The quest continues.
Nick
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Yup, sounds like maybe one of your drives is either down or running slow. Does it have any RAID protection, a la RAID 3 or RAID 5?
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No, it’s merely striped.
Nick
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Just to follow up…
We used the AJA system check to test a 3rd FCP workstation – which also had very high read and write speeds. The 3rd workstation and I share the same version of Tiger – so it doesn’t seem to be that. We took the G5 across the hall and connected it to the 2nd Medea to check whether it was a Medea issue or an internal issue – read/write speeds were even slower than they were originally. We’ve already swapped the SCSI so we know it’s not that. This brings it down to a software conflict or a piece of bad hardware somewhere…
Nick
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So, you took the drive set over to another machine and got over 200 MB/sec on the same exact drives?
Hmm, curious.
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No… not on the same exact drives, but rather on an identical Medea array… We still have yet to test this array on a different machine.
Nick
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Just to clarify…
The throughput on my machine (Machine 1 & Medea 1) is writing around 46MBs and reading at 175MBs.
The throughput on the machine across the hall (Machine 2 & Medea 2) is reading/writing over 200MBs.
The throughput on my machine with the other Medea (Machine 1 & Medea 2) is writing around 40MBs & reading around 165MBs or so (don’t remember this one exactly but remember that it was definitely slower than the original arrangement).Nick
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Thanks for the clarification. Have you tried different SCSI cables/terminators, or perhaps you should swap them (it is a dual channel configuration, no?)
Jeremy
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When we took my machine across the hall we just unplugged all attatched cables, took it over, and plugged in all the cables over there (identical setup); so that test was a different Medea as well as different cables. The SCSI card has already been swapped on a previous test – didn’t change anything.
Nick
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